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Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry

Published on: August 1, 2017

A novel, tunable, multimodal microwave system for microwave reflectometry system.

M Y Wang¹, C Zhou², A D Liu²

¹Department of Physics, Nanchang University, Nanchang 330031, China.

The Review of Scientific Instruments

|October 4, 2018

Summary

This summary is machine-generated.

A new tunable, multi-channel Q-band system analyzes tokamak plasma turbulence. This Doppler backscattering diagnostic measures turbulence correlation and velocity across four radial regions simultaneously.

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Area of Science:

Plasma physics
Microwave engineering
Diagnostic techniques

Background:

Tokamak plasma research requires advanced diagnostics for turbulence analysis.
Measuring plasma turbulence properties like correlation and velocity is crucial for fusion energy development.

Purpose of the Study:

To present a novel tunable, multi-channel Q-band system for plasma diagnostics.
To enable simultaneous measurement of density fluctuations and flows in multiple radial regions of tokamak plasma.

Main Methods:

Development of a system utilizing double-sideband (DSB) modulation and a multiplier to generate four probing frequencies.
Employing adjustable probing frequency amplitude via intermediate frequency (IF) input phase control.
Laboratory testing with a rotating grating to validate system performance.

Main Results:

The system operates effectively within the Q-band frequency range (33-55 GHz).
Demonstrated tunability of channel power through adjustment of the IF input phase.
Achieved typical amplitude flatness of less than 10 dB.

Conclusions:

The developed Q-band system offers a versatile tool for tokamak plasma turbulence diagnostics.
The system's multi-channel capability and adjustable parameters facilitate detailed plasma flow and density fluctuation analysis.
This technique has potential for advancing understanding of plasma turbulence in fusion devices.